package com.xl.juc.lock8;

import java.util.concurrent.TimeUnit;

/**
 * 8锁 就是锁的8个问题
 * 1.标准情况下，两个线程先打印还是打电话？1发短信 2打电话
 * 2.sendSms延迟4s，两个线程先打印还是打电话？1发短信 2打电话
 * @author Charley
 * @create 2020-12-27
 */
public class lock1 {
    public static void main(String[] args) {
        Phone phone = new Phone();
        new Thread(()->{
            phone.sendSms();
        },"A").start();
        try {
            TimeUnit.SECONDS.sleep(1);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        new Thread(()->{phone.call();},"B").start();

    }
}
class Phone{
    //synchronized 锁的对象是方法的调用者 两个方法用的同一个锁，谁先拿到谁执行
    public synchronized void sendSms(){
        try {
            TimeUnit.SECONDS.sleep(4);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("发短信");
    }
    public synchronized void call(){
        System.out.println("打电话");
    }
}
